Preferential solvation of silver (I) cryptand 2,2,2 perchlorate complex in water-pyridine and water-DMSO mixtures

The preferential solvation of silver (I) cryptand 2,2,2 perchlorate complex has been studied in water-dimenthylsulphoxide and water-pyridine mixtures by Gibbs transfer energy and solvent transport number measurements. While the Gibbs transfer energy of silver (I) cryptand 2,2,2 cation continuously decreases, that of the perchlorate ion increases with the addition of organic component in both solvent mixtures. The solvent transport number of the salt passes through a maximum, Δ(Py) = 10.4 and Δ(DMSO) = 2.5 at X(Py) = 0.35 and X(DMSO) = 0.45 respectively. These results indicate a heteroselective solvation of the salt with the complex cation being selectively solvated by the organic component and the perchlorate ion by water.